You have been subscribed to a public bug:
After the grub splash screen, display output fails over HDMI with a Radeon 5870.
Video output over DVI is not affected, as tested by connecting an old monitor
to a DVI port instead. This issue affects all display aspects after the grub
splash; activating additional TTYs does not enable display output.
This continues to occur after selecting an older kernel version; adding flags
to grub boot menu has no impact either.
This happens via an upgrade from 9.10, as well as a clean install of 10.04 from
any of the distributions listed below.
The Desktop cd fails to display also, alternate cd can install through
text mode, and then experiences the same problem after install. I do not
believe there to be actual system breakage; sounds play after the
display output fails which show the system is still responsive.
I believe this should also be considered a regression, as this issue
never occurred on 9.10; it has been a problem with every 10.04 build I
have tested (Alpha 1, alpha 2, beta 1 and the daily build listed on
28/03/10).
Apologies for not knowing exactly which package causes this, and for my
lack of concision.
** Affects: xorg (Ubuntu)
Importance: Undecided
Status: Incomplete
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HDMI output fails after 10.04 installation
https://bugs.launchpad.net/bugs/551003
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